JAMB 2018 Physics CBT Possible 45 Questions

The Joint Admission and Matriculation Board, JAMB PHYSICS Possible CBT Questions.

We will be providing the possible random questions that has been asked severally in JAMB PHYSICS examination. Its vital to note that these questions were asked too during the Jamb mock examination.
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We want you to carefully take your pen, solve these questions and pay attention to these questions as they might be repeated in your examination. Please note, This is not an expo.. Its just a guide to help you brace your JAMB PHYSICS examination ahead..

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1.he distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear. The slope of this graph is a measure of A. Initial displacement B. Initial velocity C. Acceleration D. Half the acceleration E. Half the initial velocity.

2. For which of the underlisted quantities is the derived unit ML2T-2 correct? I Moment of a force II Work III Acceleration I only B. II only C. III only D. I and II E. II and III.

3. What volume of alcohol with a density of 8.4 x 102kg m-3 will have the same mass as 4.2m3 of petrol whose density is 7.2 x 102kg m-3? A. 1.4 m3 B. 3.6 m3 C. 4.9 m3 D. 5.0 m3 E. 5.8 m3.

4. For correcting long sight defects in the human eye we require a A. Converging lens B. Diverging lens C. Microscope D. Periscope E. Plain glass sheet.

5. The unit quantity of electricity is called A. The ampere B. The volt C. The coulomb D. The ammeter E. Electromotive force.

6. The resistance of a wire depends on A. The length of the wire B. The diameter of the wire C. The temperature of the wire D. The resistivity of the wire E. All of the above.

7. Two cells, each of e.m.f. 1.5V and an internal resistance 2Ohms are connected in parallel. Calculate the current flowing when the cells are connected to a 1 Ohms resistor. A. 0.75 Ohms B. 1.5 Ohms C. 0.5 Ohms D. 1.0 Ohms E. 0.6 Ohms

8. Which of the following can be described as high tension transmission? A. High resistance and low voltage B. Low current and high voltage C. High current and low voltage D. High voltage and zero current E. High current and low resistance.

9. A uniform cylindrical block of wood floats in water with one-third of its height above the water level. In a liquid of relative density 0.8, What fraction of its height will be above the liquid level? A. 1/6 B. 1/ 5 C. 1/ 3 D. 4/5 E. 5/ 6.

10. Two liquids, P at a temperature of 200C and Q at a temperature of 800C have specific heat capacities of 1.0J kg-1 0C-1 and 1.5J kg-1 0C-1 respectively. If equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is A. 440C B. 500C C. 560C D. 600C E. 700C.
11. In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. The unit of the slope of the resulting curve is A. Force B. Force/m C. Work D. Force/m3 E. Energy/m2.

12. Water shows anomalous behaviour A. Below 00C B. Between 00C and 40C C. At exactly 40C D. Between 40C and 1000C E. Above 1000C

13. Two thermos flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 00C. After some time the temperatures were found to be èx, èy respectively . given that Vx = 2 and èx = ½ Vy èy The ratio of the heat flow into the flasks is 1/4 B. ½ C. 4 D. 1 E. 2

14. A good calorimeter should be of A. Low specific heat capacity and low heat conductivity. B. Low specific heat capacity and high heat conductivity. C. High specific heat capacity and low heat conductivity D. High specific heat capacity and low heat conductivity, E. Dull surface and low heat conductivity.

15. Which of the following features is NOT a characteristic of natural radioactivity? A. Radioactivity is a nuclear phenomenon. B. Radioactivity is exhibited only by elements of mass number greater 206. C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings. D. The radioactive element is transformed into a new element.

16. Which of the following statements is NOT correct? A. The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye. B. Longsighted people have difficulty in making the eye lens sufficiently powerful to the focus on nearby objects.
a. What is the number of neutrons in the Uranium isotope 238 92X? A. 92 B. 146 C. 238 D. 330 E. 119
b. Which of the following represents the correct precision if the length of a piece of wire is measured with a metre rule? A. 35 mm B. 35.0 mm C. 35.00 mm D. 35.01 mm

c. In which of the following arrangements is the wavelength in an increasing order? A. Gamma rays, infra-red rays, X-rays, radiowaves. B. Gamma rays, X-rays, infra-red rays, radiowaves. C. Radiowaves, X-rays, gamma rays, infra-red rays. D. Infra-red rays, radiowaves, X-rays, gamma rays.

17. If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface? A. sin-1 ½ B. Sin-1 2/3 C. Sin-1 ¾ D. Sin-1 8/9

18. A dentist obtains a linear magnification of 4 of a hole in a tooth by placing a concave mirror at a distance of 2.0cm from the tooth. The radius of curvature of the mirror is A. 5.3 cm B. 3.2 cm C. 2.7 cm D. 1.6 cm

19. Which of the following is true of the loudness of sound? It A. Depends on the square of the amplitude of the vibrating body. B. Is proportional to the distance of the observer from the source of the sound. C. Is greatest in vacuum D. Is independent of frequency.

20. What is the effect of the increase in the size of the hole of a pin-hole camera on the image? It A. Gives a blurred image. B. Corrects for chromatic aberration C. Magnifies the image D. Brings the image into the sharper focus.

21. A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320m s-1, what is the frequency of the clapping? A. I Hz B. 2 Hz C. 4 Hz D. 8 Hz.

22. When white light is dispersed by a spectrometer, the component having the shortest wavelength is A. Orange B. Green C. Violet D. Red.

23. Which of the following statements is TRUE of ultraviolet, visible and infra-red rays? A. They are all electromagnetic waves with the same wavelength. B. Ultra-violet rays have shorter wvelenghts than infra-red rays and produce fluorescence. C. Infra-red rays have shorter wavelength than visible light and produce the sensation of heat. D. The wavelengths increase in the sequence: visible, ultra-violet, infra-red.

24. A spectrum of sunlight is said to be impure when A. It is made of only three colours B. It has no red colour in it C. The different colours in it overlap D. It does not contain white light.

25. A cell of internal resistance 2 ohms supplies current to a 6-ohm resistor. The efficiency of the cell is A. 12.0 % B. 25.0 % C. 33.3 % D. 75.0 %

26. When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to twothirds of its nominal value. The internal resistance of the cell is A. 1 R 3 B. 1 R 2 C. 2 R 3 E. R.

27. The principle of operation of an induction coil is based on A. Ohm’s law B. Ampere’s law C. Faraday’s law D. Coulomb’s law.

28. A dynamo primarily converts A. Mechanical energy into electrical energy B. Electrical energy into kinetic energy C. Potential energy into kinetic energy D. Kinetic energy into potential energy.

29. In a certain fusion reaction, a deuteron (21H) interacts with a triton (31H) and produces an áparticle (42He) and a second product. The second product is A. A proton B. An electron C. A neutron D. A gamma ray.

30. Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons? A. 4232X B. 2423X C. 6452X D. 6252X

31. A quantity of gas occupies a certain volume when the temperature is – 730C and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas? A. 5730C B. 3270C C. 3000C D. 1100C E. 270C

32. What is the length of the liquid column in a barometer tube that would support an atmospheric pressure of 102000 Nm-2 if the density of the liquid is 2600 kgm-3? [g = 10 ms-2]. A. 0.75m B. 0.76m C. 3.92m D. 39.23m.

33. 40cm3 of liquid is mixed with 60m3 of another liquid Q. If the density of P and Q are 1.00kg m3 and 1.6kg m3 respectively, what is the density of the mixture? A. 0.05 kg m-3 B. 1.25 kg m-3 C. 1.30 kg m-3 D. 1.36 kg m-

34. The resistances of a platinum wire at the ice and steam points are 0.75 ohm and 1.05 ohm respectively. Determine the temperature at which the resistance of the wire is 0.90 ohm A. 43.00C B. 50.00C C. 69.90C D. 87.00C

35. Which of the following conditions will make water boil at a temperature of 1000C when the atmospheric pressure is 750mm Hg? A. Increase the external pressure B. Reduce the external pressure C. Heat more rapidly at the same pressure. D. Reduce the external pressure by a quarter.

36. Which of the following statements are correct? I Land and sea breezes are natural convection currents. II Convection may occur in liquids or gases but not in solids. III The vacuum in thermos flask prevents heat loss due to convection only. A. I and II only B. II and III only C. I and III only D. I, II and III.

37. A light wave of frequency 5 x 1014 Hz moves through water which has a refractive index of 4/3. Calculate the wavelength in water if the velocity of light in air is 3 x 108 ms-1 A. 4.5 x 10-7m B. 6.0 x 10-7m C. 1.7 x 10-6m D. 2.2 x 10-6m.

38. The angle between the direction of the earth’s magnetic field and the horizontal is called the A. Angle of deviation B. Magnetic declination C. Magnetic meridian D. Angle of dip.

39. When an ebonite rod is rubbed with fur, it has A. No charge at all B. A negative charge C. A positive charge D. Negative and positive charges.

40. The maximum permissible current through a galvanometer G of internal resistance 10Ù is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G. A. 20,000 ohms in parallel B. 19,990 ohms in series C. 1,990 ohms in series D. 100 ohms in serie

41. In alternating current theory, the unites of impedance, r.m.s. voltage and resonance frequency are respectively equal to A. Volt, ampere and hertz B. Ohm, volt and hertz C. Watt, ohm and radian D. Ohm, hertz and joule.

42. After three half life, the function of a radioactive material that has decayed is A. 1/8 B. 1/3 C. 2/3 D. 7/8.

43. The thermometric property of the thermocouple is that its A. e.m.f. changes with temperature B. Resistance changes with temperature C. Volume changes with temperature D. Pressure changes with resistance.
44. When the volume of a given mass of gas in halved and its temperature doubled, the pressure A. Remains constant B. Increases by a factor of 4 C. Increases by a factor of 3 D. Decreases by a factor of 4.

45. 200g of water at 900C is mixed with 100g of water at 300C. What is the final temperature? A. 500C B. 600C C. 700C D. 800C

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